Janik, Inga, Martyna Maciejewska, Anna Fabian-Danielewska, Katarzyna Korabiusz, Agata Wawryków, and Monika Stecko. 2018. “Emotional Disorders in the Perinatal Period”. Journal of Education, Health and Sport 8 (9):983-89. https://apcz.umk.pl/JEHS/article/view/5980.